4: Marco Reus | Dortmund to Manchester United
The Dortmund winger was a crucial part of his side's success story in last season's Champions League, and remains a key figure for Jurgen Klopp.
Somewhat standing in the shadow of Mario Gotze last term, he's now leading the way this year alongside Lewandowski and co.
Manchester United are reportedly interested in bringing him to Old Trafford as David Moyes looks to improve his squad. It would undoubtedly be a massive coup if they did so.